2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/97181We discuss the origin of the reentrant behaviors of insulating states above the Curie temperature of the colossal magnetoresistance manganites. We consider a system where charge ordering and ferromagnetism compete with each other. In the presence of randomness which pins charge order fluctuations, entropy-driven reentrant behaviors will appear, which explains the typical temperature dependence of the resistivity for CMR manganites.2 pages, 1 figure, submitted to SCES'04Strongly Correlated Electronstext